Portable telephone



FIG. 1 is a top, front and side perspective view of a portable telephone showing our new design;

FIG. 2 is a front view;

FIG. 3 is a side view;

FIG. 4 is a rear view;

FIG. 5 is a view from above; and,

FIG. 6 is a view from below. 

The ornamental design for a portable telephone, as shown and described. 